/*

 * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.

 * All rights reserved.

 *

 * This source code is licensed under both the BSD-style license (found in the

 * LICENSE file in the root directory of this source tree) and the GPLv2 (found

 * in the COPYING file in the root directory of this source tree).

 * You may select, at your option, one of the above-listed licenses.

 */

 #ifndef ZSTDMT_COMPRESS_H

 #define ZSTDMT_COMPRESS_H

 #if defined (__cplusplus)

 extern "C" {

 #endif

/* Note : This is an internal API.

 *        Some methods are still exposed (ZSTDLIB_API),

 *        because it used to be the only way to invoke MT compression.

 *        Now, it's recommended to use ZSTD_compress_generic() instead.

 *        These methods will stop being exposed in a future version */

/* ===   Dependencies   === */

#include <stddef.h>                /* size_t */

#define ZSTD_STATIC_LINKING_ONLY   /* ZSTD_parameters */

#include "zstd.h"            /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTDLIB_API */

/* ===   Memory management   === */

typedef struct ZSTDMT_CCtx_s ZSTDMT_CCtx;

ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx(unsigned nbWorkers);

ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbWorkers,

                                                    ZSTD_customMem cMem);

ZSTDLIB_API size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx);

ZSTDLIB_API size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx);

/* ===   Simple one-pass compression function   === */

ZSTDLIB_API size_t ZSTDMT_compressCCtx(ZSTDMT_CCtx* mtctx,

                                       void* dst, size_t dstCapacity,

                                 const void* src, size_t srcSize,

                                       int compressionLevel);

/* ===   Streaming functions   === */

ZSTDLIB_API size_t ZSTDMT_initCStream(ZSTDMT_CCtx* mtctx, int compressionLevel);

ZSTDLIB_API size_t ZSTDMT_resetCStream(ZSTDMT_CCtx* mtctx, unsigned long long pledgedSrcSize);  /**< if srcSize is not known at reset time, use ZSTD_CONTENTSIZE_UNKNOWN. Note: for compatibility with older programs, 0 means the same as ZSTD_CONTENTSIZE_UNKNOWN, but it will change in the future to mean "empty" */

ZSTDLIB_API size_t ZSTDMT_compressStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output, ZSTD_inBuffer* input);

ZSTDLIB_API size_t ZSTDMT_flushStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output);   /**< @return : 0 == all flushed; >0 : still some data to be flushed; or an error code (ZSTD_isError()) */

ZSTDLIB_API size_t ZSTDMT_endStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output);     /**< @return : 0 == all flushed; >0 : still some data to be flushed; or an error code (ZSTD_isError()) */

/* ===   Advanced functions and parameters  === */

#ifndef ZSTDMT_JOBSIZE_MIN

#  define ZSTDMT_JOBSIZE_MIN (1U << 20)   /* 1 MB - Minimum size of each compression job */

#endif

ZSTDLIB_API size_t ZSTDMT_compress_advanced(ZSTDMT_CCtx* mtctx,

                                           void* dst, size_t dstCapacity,

                                     const void* src, size_t srcSize,

                                     const ZSTD_CDict* cdict,

                                           ZSTD_parameters params,

                                           unsigned overlapLog);

ZSTDLIB_API size_t ZSTDMT_initCStream_advanced(ZSTDMT_CCtx* mtctx,

                                        const void* dict, size_t dictSize,   /* dict can be released after init, a local copy is preserved within zcs */

                                        ZSTD_parameters params,

                                        unsigned long long pledgedSrcSize);  /* pledgedSrcSize is optional and can be zero == unknown */

ZSTDLIB_API size_t ZSTDMT_initCStream_usingCDict(ZSTDMT_CCtx* mtctx,

                                        const ZSTD_CDict* cdict,

                                        ZSTD_frameParameters fparams,

                                        unsigned long long pledgedSrcSize);  /* note : zero means empty */

/* ZSTDMT_parameter :

 * List of parameters that can be set using ZSTDMT_setMTCtxParameter() */

typedef enum {

    ZSTDMT_p_jobSize,           /* Each job is compressed in parallel. By default, this value is dynamically determined depending on compression parameters. Can be set explicitly here. */

    ZSTDMT_p_overlapSectionLog  /* Each job may reload a part of previous job to enhance compressionr ratio; 0 == no overlap, 6(default) == use 1/8th of window, >=9 == use full window. This is a "sticky" parameter : its value will be re-used on next compression job */

} ZSTDMT_parameter;

/* ZSTDMT_setMTCtxParameter() :

 * allow setting individual parameters, one at a time, among a list of enums defined in ZSTDMT_parameter.

 * The function must be called typically after ZSTD_createCCtx() but __before ZSTDMT_init*() !__

 * Parameters not explicitly reset by ZSTDMT_init*() remain the same in consecutive compression sessions.

 * @return : 0, or an error code (which can be tested using ZSTD_isError()) */

ZSTDLIB_API size_t ZSTDMT_setMTCtxParameter(ZSTDMT_CCtx* mtctx, ZSTDMT_parameter parameter, unsigned value);

/*! ZSTDMT_compressStream_generic() :

 *  Combines ZSTDMT_compressStream() with optional ZSTDMT_flushStream() or ZSTDMT_endStream()

 *  depending on flush directive.

 * @return : minimum amount of data still to be flushed

 *           0 if fully flushed

 *           or an error code

 *  note : needs to be init using any ZSTD_initCStream*() variant */

ZSTDLIB_API size_t ZSTDMT_compressStream_generic(ZSTDMT_CCtx* mtctx,

                                                ZSTD_outBuffer* output,

                                                ZSTD_inBuffer* input,

                                                ZSTD_EndDirective endOp);

/* ========================================================

 * ===  Private interface, for use by ZSTD_compress.c   ===

 * ===  Not exposed in libzstd. Never invoke directly   ===

 * ======================================================== */

size_t ZSTDMT_CCtxParam_setMTCtxParameter(ZSTD_CCtx_params* params, ZSTDMT_parameter parameter, unsigned value);

size_t ZSTDMT_CCtxParam_setNbWorkers(ZSTD_CCtx_params* params, unsigned nbWorkers);

/*! ZSTDMT_updateCParams_whileCompressing() :

 *  Updates only a selected set of compression parameters, to remain compatible with current frame.

 *  New parameters will be applied to next compression job. */

void ZSTDMT_updateCParams_whileCompressing(ZSTDMT_CCtx* mtctx, const ZSTD_CCtx_params* cctxParams);

 */

ZSTD_frameProgression ZSTDMT_getFrameProgression(ZSTDMT_CCtx* mtctx);

/*! ZSTDMT_initCStream_internal() :

 *  Private use only. Init streaming operation.

 *  expects params to be valid.

 *  must receive dict, or cdict, or none, but not both.

 *  @return : 0, or an error code */

size_t ZSTDMT_initCStream_internal(ZSTDMT_CCtx* zcs,

                    const void* dict, size_t dictSize, ZSTD_dictContentType_e dictContentType,

                    const ZSTD_CDict* cdict,

                    ZSTD_CCtx_params params, unsigned long long pledgedSrcSize);

#if defined (__cplusplus)

}

#endif

#endif   /* ZSTDMT_COMPRESS_H */